Rock-drill.



PATENTED JULY 28, 1908.

H. J. G. KEYMER.

ROCK DRILL. APPLIOATION FILED TANKS, 1907.

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No. 894,213. PATENTED. JULY 28, 1908.

. H. J. 0. KEYMER.

ROCK DRILL.

APIfLIOATION FILED JAN. 8, 1907.

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PATENTED JULY 28, 1908.

H. J. c. KEYMER.

- ROCK DRILL. APPLICATION FILED JAN. 8, 1907.

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|NVENT2R. "HENRY JEHN Guam-T KEYM ER WITNESSES;

.boring tool or bit UNITED STATES I ATEN T OFFICE.

ROCK-DRILL.

Application filed January 8,

' To all whom it may concern:

Be it known that I, HENRY J OHN OUBITT KEYMER, a subject of the King of the United Kingdom of Great Britain and Ireland, and resident of Gorlestonon-Sea, Great Yarmouth, England, have invented a certain new and useful Improvement in Rock-Drills, of which the following is a specification.

This invention relates to improvements in drills and more especially to pneumatically operated rock drills of the kind in which the receives a rotary movement from suitable mechanism and is also subjected to intermittent blows from a hammer or the like.

My improvement consists primarily in an improved construction of drill wherein a pair of tools are actuated (hammered and rotated) alternatively.

An important part of the invention is an improved mechanism for transmitting the movement of the piston to the tool actuating means.

Further improvements are referred to in the following description and indicated in the Specification of Letters Patent.

accompanying drawings.

In said drawings Figure 1 is a side elevation: Fig. 1 is a part vertical section and art elevation of the construction shown in ig. 1. Fig. 2 an end elevation (with the hammers and helves removed), and Fig. 3 a plan (with one hammer and helve removed), showing the preferred construction with a pair of bits intermittently rotated by ratchet mechanism with which cooperate a pair of pivoted hammers serving to drive the tools into the rock. It will be seen that the ratchet devices receive their movements from the same devices as actuate the hammer mechanism. Fig. 4 is a side elevation and Fig. 5 a part plan showing a modified construction in which the power is applied directly to the hammers and movement transmitted therefrom to the ratchet mechanism.

Referring to the construction shown in Figs. 1 to 3 the improved drill comprises a cylinder A within which reciprocates the piston B which is provided with a slot B located midway between its ends. The said slot is engaged by the rounded end of a lever C pivoted on a pin D working in bearings E and E projecting from the cylinder casting. The lever C is provided with two wings or arms C and C for operating hammers, F and F carried at the ends of spring handles or helves G and G Each hammer is coni I Patented July 28, 1908'. 1907. Serial No. 351,341.

nected by bolts [2 and nuts 5* fitted thereto, with one of each of the upper and lower springs, and the other ends of each pair (G or G of springs are connected, by bolts (0* (which pass through openings a and nuts (4*, with. the arms C and C The drills X are held by ratchet-headed sockets H and H which revolve within the cylinder cover arms or bearings K and K The mechanism is o erated by admitting compressed air orthe ike into the chamber or chest L between two piston valves M and M which are actuated by the valve levers P and P which are ivoted upon the pins Q and Q and pass tl rough slots 0 and O in the shell of the chamber or chest L. The levers P and P and N 2 of the piston valves M and M while the opposite ends of said levers P and P are in contact with and work upon the periphery of a trip cam or yoke R carried by the pin D. The cam R is actuated by the pin S projecting from the lever C, a curve in the cam path allowing the necessary travel of the lever O and the pin S to take place before the operation of the cam reverses the positions of the valves M and M so as to admit the com pressed fluid to the reverse ends of the piston The portways of the valves M and M are thus alternately brought into communication with the ports M M to the cylinder, Figs. 1 and 3 showing the portway M open to the ort M in the cylinder, while portway M is c osed to the port l\/ 6 at the other end of the cylinder;.the end of the valve M is clear of the port M and allows the exhaust to pass freely out of the exhaust port V in the cylinder cover K The opposite end S of the pin S to that operating the cam R projects clear of the cylinder casting and reciprocates a pawl bar Z which is guided between and upon.

rollers 1, 1 r and ternately through the pawls Z and Z the ratchet drill sockets H and H and thus rotates the tools X so that their cutting ed es are at a fresh angle or facet of the rock for t e next blow of the hammers F and F alternately. The whole machine is carried and directed to its work by the stem Y which is held by a tunnel bar, tripod or other suitable support.

In the apparatus shown in Figs. 4 and 5 the power is a plied directly to the hammers instead of to t e double ended piston by arranging the hammers to work within two cylinders and hammer guides disposed parr*, and operates alengage at one end recesses N allel to one another and to cooperate with a double ended lever working upon a central axis, each end of which lever is in contact with one of the hammers so that forward movement of one hammer actuates the other hammer in the opposite direction.

The main structure comprises side frames a between the ends of which are fixed the cylinders and hammer guides 12 and 1) directly over the drill sockets h and h working within the bearings k and 762.

Working within the cylinders and guides 19 and b are hammers c and 0 combined with pistons c and c. The hammers c and 0 have projections d and d between which work respectively the ends 6 and e of the lever e oscillating upon the axis f between the said side frames. Thus by admittin com pressed fluid to either cylinder the ever 0 moves the knuckle joint g forming part of the lever e and which in its turn operates the valve lever Z working upon the axis m and in contact with the valve rod bridle n at the end 1 of the said lever Z.

The valve chests 0 and 0 are attached to the ends of the cylinders b and b and are connected by the pipe p for the compressed fluid supply. -Within the valve chests 0 and 0 work the iston valves g and g connected by the bride n and the rods r and r the movements of which rods are controlled by the end 1 of the lever Z so that one piston c is open to and receives the full supply of com ressed fluid while the other piston c is expe ling the fluid previously used in its reverse motion through the exhaust ports 8 of the valve chest 0 The valves g and g thus change position according to the alternating application of the power and motion of the pistons c and 0. Through the medium of the axis f fixed in the lever 0 power is transmitted by the levers t and t to the pawl bar w actuating in turn the drill sockets h and 71/2, and thereby the drills 00. Instead of compressed air I may utilize the power obtained by combustion of an explo sive mixture to operate the drill.

Having now described my invention what I claim and desire to secure by Letters Patent of the United States is 1. In a rock drill, incombination, a air of boring tools, means for rotating saic tools intermittently, hammers tools alternately, connections adapted to operate by air under pressure for moving said hammer, valves for controlling said connections, and lever devices for controlling the operation of the valves and the operation of the tool-rotatin means.

2. In a rock drill, in combination, a air of boring tools, means for rotating sai tools intermittently, hammers for striking said tools alternately, connections adapted to be operated by air under pressure, and comprising a percussion piston for moving said hammers, means for assuring that the operation of the hammers and the operation of the tools shall take place alternately, and valves for controlling the supply of air under pressure to the apparatus.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY JOHN CUBITT KEYMER.

for striking said 

